Java example source code file (BasicParserConfiguration.java)
The BasicParserConfiguration.java Java example source code/*
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/*
* Copyright 2001-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
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package com.sun.org.apache.xerces.internal.parsers;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;
import com.sun.org.apache.xerces.internal.impl.Constants;
import com.sun.org.apache.xerces.internal.util.FeatureState;
import com.sun.org.apache.xerces.internal.util.ParserConfigurationSettings;
import com.sun.org.apache.xerces.internal.util.PropertyState;
import com.sun.org.apache.xerces.internal.util.Status;
import com.sun.org.apache.xerces.internal.util.SymbolTable;
import com.sun.org.apache.xerces.internal.xni.XMLDTDContentModelHandler;
import com.sun.org.apache.xerces.internal.xni.XMLDTDHandler;
import com.sun.org.apache.xerces.internal.xni.XMLDocumentHandler;
import com.sun.org.apache.xerces.internal.xni.XNIException;
import com.sun.org.apache.xerces.internal.xni.parser.XMLComponent;
import com.sun.org.apache.xerces.internal.xni.parser.XMLComponentManager;
import com.sun.org.apache.xerces.internal.xni.parser.XMLConfigurationException;
import com.sun.org.apache.xerces.internal.xni.parser.XMLDocumentSource;
import com.sun.org.apache.xerces.internal.xni.parser.XMLEntityResolver;
import com.sun.org.apache.xerces.internal.xni.parser.XMLErrorHandler;
import com.sun.org.apache.xerces.internal.xni.parser.XMLInputSource;
import com.sun.org.apache.xerces.internal.xni.parser.XMLParserConfiguration;
/**
* A very basic parser configuration. This configuration class can
* be used as a base class for custom parser configurations. The
* basic parser configuration creates the symbol table (if not
* specified at construction time) and manages all of the recognized
* features and properties.
* <p>
* The basic parser configuration does <strong>not mandate
* any particular pipeline configuration or the use of specific
* components except for the symbol table. If even this is too much
* for a basic parser configuration, the programmer can create a new
* configuration class that implements the
* <code>XMLParserConfiguration interface.
* <p>
* Subclasses of the basic parser configuration can add their own
* recognized features and properties by calling the
* <code>addRecognizedFeature and
* <code>addRecognizedProperty methods, respectively.
* <p>
* The basic parser configuration assumes that the configuration
* will be made up of various parser components that implement the
* <code>XMLComponent interface. If subclasses of this
* configuration create their own components for use in the
* parser configuration, then each component should be added to
* the list of components by calling the <code>addComponent
* method. The basic parser configuration will make sure to call
* the <code>reset method of each registered component
* before parsing an instance document.
* <p>
* This class recognizes the following features and properties:
* <ul>
* <li>Features
* <ul>
* <li>http://xml.org/sax/features/validation
* <li>http://xml.org/sax/features/namespaces
* <li>http://xml.org/sax/features/external-general-entities
* <li>http://xml.org/sax/features/external-parameter-entities
* </ul>
* <li>Properties
* <ul>
* <li>http://xml.org/sax/properties/xml-string
* <li>http://apache.org/xml/properties/internal/symbol-table
* <li>http://apache.org/xml/properties/internal/error-handler
* <li>http://apache.org/xml/properties/internal/entity-resolver
* </ul>
* </ul>
*
* @author Arnaud Le Hors, IBM
* @author Andy Clark, IBM
*
* @version $Id: BasicParserConfiguration.java,v 1.6 2010-11-01 04:40:09 joehw Exp $
*/
public abstract class BasicParserConfiguration
extends ParserConfigurationSettings
implements XMLParserConfiguration {
//
// Constants
//
// feature identifiers
/** Feature identifier: validation. */
protected static final String VALIDATION =
Constants.SAX_FEATURE_PREFIX + Constants.VALIDATION_FEATURE;
/** Feature identifier: namespaces. */
protected static final String NAMESPACES =
Constants.SAX_FEATURE_PREFIX + Constants.NAMESPACES_FEATURE;
/** Feature identifier: external general entities. */
protected static final String EXTERNAL_GENERAL_ENTITIES =
Constants.SAX_FEATURE_PREFIX + Constants.EXTERNAL_GENERAL_ENTITIES_FEATURE;
/** Feature identifier: external parameter entities. */
protected static final String EXTERNAL_PARAMETER_ENTITIES =
Constants.SAX_FEATURE_PREFIX + Constants.EXTERNAL_PARAMETER_ENTITIES_FEATURE;
// property identifiers
/** Property identifier: xml string. */
protected static final String XML_STRING =
Constants.SAX_PROPERTY_PREFIX + Constants.XML_STRING_PROPERTY;
/** Property identifier: symbol table. */
protected static final String SYMBOL_TABLE =
Constants.XERCES_PROPERTY_PREFIX + Constants.SYMBOL_TABLE_PROPERTY;
/** Property identifier: error handler. */
protected static final String ERROR_HANDLER =
Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_HANDLER_PROPERTY;
/** Property identifier: entity resolver. */
protected static final String ENTITY_RESOLVER =
Constants.XERCES_PROPERTY_PREFIX + Constants.ENTITY_RESOLVER_PROPERTY;
//
// Data
//
// components (non-configurable)
/** Symbol table. */
protected SymbolTable fSymbolTable;
// data
/** Locale. */
protected Locale fLocale;
/** Components. */
protected ArrayList fComponents;
// handlers
/** The document handler. */
protected XMLDocumentHandler fDocumentHandler;
/** The DTD handler. */
protected XMLDTDHandler fDTDHandler;
/** The DTD content model handler. */
protected XMLDTDContentModelHandler fDTDContentModelHandler;
/** Last component in the document pipeline */
protected XMLDocumentSource fLastComponent;
//
// Constructors
//
/** Default Constructor. */
protected BasicParserConfiguration() {
this(null, null);
} // <init>()
/**
* Constructs a parser configuration using the specified symbol table.
*
* @param symbolTable The symbol table to use.
*/
protected BasicParserConfiguration(SymbolTable symbolTable) {
this(symbolTable, null);
} // <init>(SymbolTable)
/**
* Constructs a parser configuration using the specified symbol table
* and parent settings.
*
* @param symbolTable The symbol table to use.
* @param parentSettings The parent settings.
*/
protected BasicParserConfiguration(SymbolTable symbolTable,
XMLComponentManager parentSettings) {
super(parentSettings);
// create a vector to hold all the components in use
fComponents = new ArrayList();
// create table for features and properties
fFeatures = new HashMap();
fProperties = new HashMap();
// add default recognized features
final String[] recognizedFeatures = {
PARSER_SETTINGS,
VALIDATION,
NAMESPACES,
EXTERNAL_GENERAL_ENTITIES,
EXTERNAL_PARAMETER_ENTITIES,
};
addRecognizedFeatures(recognizedFeatures);
fFeatures.put(PARSER_SETTINGS, Boolean.TRUE);
// set state for default features
fFeatures.put(VALIDATION, Boolean.FALSE);
fFeatures.put(NAMESPACES, Boolean.TRUE);
fFeatures.put(EXTERNAL_GENERAL_ENTITIES, Boolean.TRUE);
fFeatures.put(EXTERNAL_PARAMETER_ENTITIES, Boolean.TRUE);
// add default recognized properties
final String[] recognizedProperties = {
XML_STRING,
SYMBOL_TABLE,
ERROR_HANDLER,
ENTITY_RESOLVER,
};
addRecognizedProperties(recognizedProperties);
if (symbolTable == null) {
symbolTable = new SymbolTable();
}
fSymbolTable = symbolTable;
fProperties.put(SYMBOL_TABLE, fSymbolTable);
} // <init>(SymbolTable)
/**
* Adds a component to the parser configuration. This method will
* also add all of the component's recognized features and properties
* to the list of default recognized features and properties.
*
* @param component The component to add.
*/
protected void addComponent(XMLComponent component) {
// don't add a component more than once
if (fComponents.contains(component)) {
return;
}
fComponents.add(component);
// register component's recognized features
String[] recognizedFeatures = component.getRecognizedFeatures();
addRecognizedFeatures(recognizedFeatures);
// register component's recognized properties
String[] recognizedProperties = component.getRecognizedProperties();
addRecognizedProperties(recognizedProperties);
// set default values
if (recognizedFeatures != null) {
for (int i = 0; i < recognizedFeatures.length; i++) {
String featureId = recognizedFeatures[i];
Boolean state = component.getFeatureDefault(featureId);
if (state != null) {
super.setFeature(featureId, state.booleanValue());
}
}
}
if (recognizedProperties != null) {
for (int i = 0; i < recognizedProperties.length; i++) {
String propertyId = recognizedProperties[i];
Object value = component.getPropertyDefault(propertyId);
if (value != null) {
super.setProperty(propertyId, value);
}
}
}
} // addComponent(XMLComponent)
//
// XMLParserConfiguration methods
//
/**
* Parse an XML document.
* <p>
* The parser can use this method to instruct this configuration
* to begin parsing an XML document from any valid input source
* (a character stream, a byte stream, or a URI).
* <p>
* Parsers may not invoke this method while a parse is in progress.
* Once a parse is complete, the parser may then parse another XML
* document.
* <p>
* This method is synchronous: it will not return until parsing
* has ended. If a client application wants to terminate
* parsing early, it should throw an exception.
*
* @param inputSource The input source for the top-level of the
* XML document.
*
* @exception XNIException Any XNI exception, possibly wrapping
* another exception.
* @exception IOException An IO exception from the parser, possibly
* from a byte stream or character stream
* supplied by the parser.
*/
public abstract void parse(XMLInputSource inputSource)
throws XNIException, IOException;
/**
* Sets the document handler on the last component in the pipeline
* to receive information about the document.
*
* @param documentHandler The document handler.
*/
public void setDocumentHandler(XMLDocumentHandler documentHandler) {
fDocumentHandler = documentHandler;
if (fLastComponent != null) {
fLastComponent.setDocumentHandler(fDocumentHandler);
if (fDocumentHandler !=null){
fDocumentHandler.setDocumentSource(fLastComponent);
}
}
} // setDocumentHandler(XMLDocumentHandler)
/** Returns the registered document handler. */
public XMLDocumentHandler getDocumentHandler() {
return fDocumentHandler;
} // getDocumentHandler():XMLDocumentHandler
/**
* Sets the DTD handler.
*
* @param dtdHandler The DTD handler.
*/
public void setDTDHandler(XMLDTDHandler dtdHandler) {
fDTDHandler = dtdHandler;
} // setDTDHandler(XMLDTDHandler)
/** Returns the registered DTD handler. */
public XMLDTDHandler getDTDHandler() {
return fDTDHandler;
} // getDTDHandler():XMLDTDHandler
/**
* Sets the DTD content model handler.
*
* @param handler The DTD content model handler.
*/
public void setDTDContentModelHandler(XMLDTDContentModelHandler handler) {
fDTDContentModelHandler = handler;
} // setDTDContentModelHandler(XMLDTDContentModelHandler)
/** Returns the registered DTD content model handler. */
public XMLDTDContentModelHandler getDTDContentModelHandler() {
return fDTDContentModelHandler;
} // getDTDContentModelHandler():XMLDTDContentModelHandler
/**
* Sets the resolver used to resolve external entities. The EntityResolver
* interface supports resolution of public and system identifiers.
*
* @param resolver The new entity resolver. Passing a null value will
* uninstall the currently installed resolver.
*/
public void setEntityResolver(XMLEntityResolver resolver) {
// REVISIT: Should this be a property?
fProperties.put(ENTITY_RESOLVER, resolver);
} // setEntityResolver(XMLEntityResolver)
/**
* Return the current entity resolver.
*
* @return The current entity resolver, or null if none
* has been registered.
* @see #setEntityResolver
*/
public XMLEntityResolver getEntityResolver() {
// REVISIT: Should this be a property?
return (XMLEntityResolver)fProperties.get(ENTITY_RESOLVER);
} // getEntityResolver():XMLEntityResolver
/**
* Allow an application to register an error event handler.
*
* <p>If the application does not register an error handler, all
* error events reported by the SAX parser will be silently
* ignored; however, normal processing may not continue. It is
* highly recommended that all SAX applications implement an
* error handler to avoid unexpected bugs.</p>
*
* <p>Applications may register a new or different handler in the
* middle of a parse, and the SAX parser must begin using the new
* handler immediately.</p>
*
* @param errorHandler The error handler.
* @exception java.lang.NullPointerException If the handler
* argument is null.
* @see #getErrorHandler
*/
public void setErrorHandler(XMLErrorHandler errorHandler) {
// REVISIT: Should this be a property?
fProperties.put(ERROR_HANDLER, errorHandler);
} // setErrorHandler(XMLErrorHandler)
/**
* Return the current error handler.
*
* @return The current error handler, or null if none
* has been registered.
* @see #setErrorHandler
*/
public XMLErrorHandler getErrorHandler() {
// REVISIT: Should this be a property?
return (XMLErrorHandler)fProperties.get(ERROR_HANDLER);
} // getErrorHandler():XMLErrorHandler
/**
* Set the state of a feature.
*
* Set the state of any feature in a SAX2 parser. The parser
* might not recognize the feature, and if it does recognize
* it, it might not be able to fulfill the request.
*
* @param featureId The unique identifier (URI) of the feature.
* @param state The requested state of the feature (true or false).
*
* @exception com.sun.org.apache.xerces.internal.xni.parser.XMLConfigurationException If the
* requested feature is not known.
*/
public void setFeature(String featureId, boolean state)
throws XMLConfigurationException {
// forward to every component
int count = fComponents.size();
for (int i = 0; i < count; i++) {
XMLComponent c = (XMLComponent) fComponents.get(i);
c.setFeature(featureId, state);
}
// save state if noone "objects"
super.setFeature(featureId, state);
} // setFeature(String,boolean)
/**
* setProperty
*
* @param propertyId
* @param value
*/
public void setProperty(String propertyId, Object value)
throws XMLConfigurationException {
// forward to every component
int count = fComponents.size();
for (int i = 0; i < count; i++) {
XMLComponent c = (XMLComponent) fComponents.get(i);
c.setProperty(propertyId, value);
}
// store value if noone "objects"
super.setProperty(propertyId, value);
} // setProperty(String,Object)
/**
* Set the locale to use for messages.
*
* @param locale The locale object to use for localization of messages.
*
* @exception XNIException Thrown if the parser does not support the
* specified locale.
*/
public void setLocale(Locale locale) throws XNIException {
fLocale = locale;
} // setLocale(Locale)
/** Returns the locale. */
public Locale getLocale() {
return fLocale;
} // getLocale():Locale
//
// Protected methods
//
/**
* reset all components before parsing and namespace context
*/
protected void reset() throws XNIException {
// reset every component
int count = fComponents.size();
for (int i = 0; i < count; i++) {
XMLComponent c = (XMLComponent) fComponents.get(i);
c.reset(this);
}
} // reset()
/**
* Check a property. If the property is known and supported, this method
* simply returns. Otherwise, the appropriate exception is thrown.
*
* @param propertyId The unique identifier (URI) of the property
* being set.
* @exception com.sun.org.apache.xerces.internal.xni.parser.XMLConfigurationException If the
* requested feature is not known or supported.
*/
protected PropertyState checkProperty(String propertyId)
throws XMLConfigurationException {
// special cases
if (propertyId.startsWith(Constants.SAX_PROPERTY_PREFIX)) {
final int suffixLength = propertyId.length() - Constants.SAX_PROPERTY_PREFIX.length();
//
// http://xml.org/sax/properties/xml-string
// Value type: String
// Access: read-only
// Get the literal string of characters associated with the
// current event. If the parser recognises and supports this
// property but is not currently parsing text, it should return
// null (this is a good way to check for availability before the
// parse begins).
//
if (suffixLength == Constants.XML_STRING_PROPERTY.length() &&
propertyId.endsWith(Constants.XML_STRING_PROPERTY)) {
// REVISIT - we should probably ask xml-dev for a precise
// definition of what this is actually supposed to return, and
// in exactly which circumstances.
return PropertyState.NOT_SUPPORTED;
}
}
// check property
return super.checkProperty(propertyId);
} // checkProperty(String)
/**
* Check a feature. If feature is know and supported, this method simply
* returns. Otherwise, the appropriate exception is thrown.
*
* @param featureId The unique identifier (URI) of the feature.
*
* @throws XMLConfigurationException Thrown for configuration error.
* In general, components should
* only throw this exception if
* it is <strong>really
* a critical error.
*/
protected FeatureState checkFeature(String featureId)
throws XMLConfigurationException {
//
// Xerces Features
//
if (featureId.startsWith(Constants.XERCES_FEATURE_PREFIX)) {
final int suffixLength = featureId.length() - Constants.XERCES_FEATURE_PREFIX.length();
//
// special performance feature: no one by component manager is allowed to set it
//
if (suffixLength == Constants.PARSER_SETTINGS.length() &&
featureId.endsWith(Constants.PARSER_SETTINGS)) {
return FeatureState.NOT_SUPPORTED;
}
}
return super.checkFeature(featureId);
} // checkFeature(String)
} // class BasicParserConfiguration
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